This one of the simple machines can be made by using a wheel & a rope
Manufacturers of fireworks use barium to give off a green color & sodium to produce this color
Inhaling & exhaling result from the contraction of this muscle at the floor of the chest cavity
(Sarah of the Clue Crew at Sea World in San Diego) In the wild, the polar bear feeds mainly on these, especially the ringed species
The elements erbium, terbium, ytterbium & yttrium are named for the town of Ytterby in this country
Developed by British inventor John Starley, the safety bicycle features these of equal size
Anthropologist Francis Galton notes the uniqueness of these for every individual, a help to police
Designed by William L. Jenney, the first of these buildings, the 10-story Home Insurance Co., goes up in Chicago
German engineer Carl Friedrich Benz develops the first working one of these powered by a gasoline engine
American electrical engineer William Stanley invents this device for changing energy from AC to DC